[Primexd] B-field effect

[Igal Jaegle]

Tyler,

You can find my updated talk of Friday here: https://halldweb.jlab.org/wiki-private/images/c/cb/Primexd-igal-jaegle-21052021.pdf

I also put the latex & fig in /work/halld/home/ijaegle/public/ForTylerH/21052021.tar.gz

I added the comparison for the LH2 data set between TOF only (to veto charged particles) and FDC/CDC (to veto charged particles)

Roughly w/o the TOF but with using the B-field/FDC/CDC the background will be roughly twice larger than what we have now i.e. w/o B-field but TOF used as a veto. Also, I believe the background level can be further decreased by requiring looser conditions for trks.

tks ig.

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